原生煤和构造煤的吸附等量线比较及与瓦斯突出的关系研究

Research about comparison on adsorption isostere between indigenous coal and tectonic coal and its relationship with outburst of gas

根据温度-压力-吸附方程及其相关变换方程,将沁水盆地大宁煤矿的原生煤和构造煤系列等温吸附实验数据,转换成可进行热力学相关比较和计算的吸附等量线;在对甲烷气体相同吸附量下,原生煤吸附等量线的温度、压力升速大于构造煤;随着吸附量的增加,原生煤的吸附等量线与构造煤的吸附等量线相交;交点之前,在相同吸附量和相同温度下,构造煤(小坚固性系数)的吸附压力大于原生煤(大坚固性系数)的吸附压力;交点之后,在相同吸附量和相同压力下,构造煤的平衡温度高于原生煤;在吸附量都为35 cm^3/g时,原生煤的单位等量解吸热为0.835 kJ·g/(mol·cm^3),比构造煤多吸热0.204 kJ·g/(mol·cm^3);相较于原生煤,构造煤优先解吸瓦斯;研究认为煤与瓦斯突出最容易发生在构造煤。

according to temperature-pressure-adsorption equation and its related transformational equation,convert the isothermal adsorption experimental data of indigenous coal and tectonic coal series from Qinshui Basin into adsorption isostere that could do thermodynamics related comparison and calculation;Under the same adsorption capacity for methane gas,the temperature and pressure rising speed of the adsorption isoline of indigenous coal is greater than that of structural coal;Along with the increase of adsorption capacity,the adsorption isoline of indigenous coal intersects with the adsorption isoline of structural coal;before the intersection,under the same adsorption capacity and temperature,the adsorption pressure of structural coal(small firmness coefficient)is greater than that of indigenous coal(large firmness coefficient)Pressure:after the intersection,the equilibrium temperature of structural coal is higher than that of indigenous coal under the same adsorption capacity and pressure;when the adsorption capacity is 35 cm^3/g for both,the unit equivalent desorption heat of indigenous coal is 0.835 kJ·g/(mol·cm^3),which is 0.204 kJ·g/(mol·cm^3)more than that of structural coal;compared with indigenous coal,structural coal has the priority to desorb gas;the study considers that coal and gas outburst is most likely to occur in structural coal.